HC Deb 10 May 1990 vol 172 c189W
Mr. Soley

To ask the Secretary of State for the Environment if he is planning to discontinue the system of revision of bench mark levels in the British Isles.

Mr. Trippier

Bench marks established by Ordnance Survey in Great Britain are maintained at predetermined levels which are dependent on the type of terrain and degree of land development. Levelling policy is kept under periodic review.

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